| Abbreviation | Definition |
|---|---|
| RNAS | Royal Naval Air Service |
| RNAS | Royal Naval Air Station |
| RNB | Royal Naval Barracks |
| RNCA | Royal Naval Communications Association |
| RNCA | Royal Navy Commando Association |
| RNCC | Royal Naval College of Canada |
| RNEC | Royal Naval Engineering College |
| RNOC | Royal Navy Officers Charity |
| RNPS | Royal Naval Patrol Service |
| RNRM | Royal Navy and Royal Marines |
| RNRT | Royal Naval Reserve Trawler |
| RNSA | Royal Naval Sailing Association |
| RNT | Ratan Naval Tata |
| RNTD | Royal Navy Torpedo Depot |
| RONLY | Receiver Only (US Navy) |
| RP1 | ligious Program Specialist Petty Officer First Class |
| RP1 | Religious Program Specialist Petty Officer First Class |
| RP2 | ligious Program Specialist Petty Officer Second Class |
| RP2 | Religious Program Specialist Petty Officer Second Class |
| RP3 | ligious Program Specialist Petty Officer Third Class |